Common mode filter

Abstract

Disclosed herein is a common mode filter having improved insertion loss characteristics. The common mode filter includes: first and second coil electrode patterns formed at an upper layer and alternately disposed; and first and second coil electrode patterns formed at a lower layer and alternately disposed, wherein the outermost pattern of the upper layer and the outermost pattern of the lower layer are coil electrode patterns having the same order.

What is claimed is: 
     
       1. A common mode filter comprising:
 first and second coil electrode patterns formed at an upper layer and alternately disposed; and 
 first and second coil electrode patterns formed at a lower layer and alternately disposed, 
 wherein the outermost pattern of the upper layer and the outermost pattern of the lower layer are coil electrode patterns having the same order, and the coil electrode patterns disposed at the upper layer and the lower layer and having the same order are overlapped with each other in the vertical direction, but have the centers misaligned with each other. 
 
     
     
       2. The common mode filter according to  claim 1 , wherein the outermost pattern of the upper layer and the outermost pattern of the lower layer are the first coil electrode patterns. 
     
     
       3. The common mode filter according to  claim 1 , wherein the outermost pattern of the upper layer and the outermost pattern of the lower layer are the second coil electrode patterns. 
     
     
       4. The common mode filter according to  claim 1 , wherein a ratio (x/L) of a horizontal center interval x between the coil electrode patterns disposed at the upper layer and the lower layer and having the same order to a horizontal center interval L between the first and second coil electrode patterns is less than 0.5. 
     
     
       5. The common mode filter according to  claim 1 , wherein in a range in which the coil electrode patterns of the upper layer and the coil electrode patterns of the lower layer do not contact each other, a ratio (h/w) of a vertical spaced distance h between the coil electrode patterns of the upper layer and the coil electrode patterns of the lower layer to a horizontal spaced distance w between the first and second coil electrode patterns is 1.5 or less.